Now we finally have gotten the system built, tuned and ready for running simulations from hereon out!
the new system specs are:
Intel i9 Extreme - 10980XE 18cores 3Ghz stock (2400Mhz cache) 256Gb DDR4 3600Mhz Kingston Fury
Asus Rampage Vi Extreme Omega
Watercooled on Noctuas new NL-LC1-36
Win 11 Pro
10Gb CFD Only: (~66c max after run)
No settings:
67m 15s (there must be something off with HT in such a vast amount of cores)
60Gb CFD+EM:
No settings:
10h 12m 31s
260Gb EM Only:
No Settings:
46m 11s
After extensive amounts of Ram-tuning, Oc’ing, Lapping the IHS of the processor, and changing TIM to Kryosheet we ended up with these results: 10980XE 18cores (HT Off) 4.7Ghz (AVX -2 /AVX512 -3) (3100Mhz Cache)
Cinebench r23 multi - 21318pts
Tighter Subtimings, including tRefi at 32768 Which brought my latency in passmark down from 46ns to 36ns
10Gb CFD Only: (~80c max after run)
No settings:
37m 58s (~44% improvement over stock)
10Gb CFD Only: (~80c max after run)
Dual Run -np8 -mpmode throughput :
62m 43s (~53% improvement)
(~31m 21s / run)
60Gb CFD+EM:
No settings:
6h 38m 18s (~35% improvement)
260Gb EM Only:
No Settings:
33m 43s (~27% improvement)
Final note: I also tried to push the cpu to 4.8Ghz, which gained me an extra 500pts in Cinebench, but only gained me an average of ~5s improvements in the benchmarks at the cost of 30w and 10c extra heat through the system, so i believe cache and further increasing ram-speeds would be where its at
I would have expected the CFD-only study to benefit from more clock speed since it doesn’t hit main memory that hard compared to the other two studies.
Yes! That was also my main reason for choosing this over a threadripper - the price is lower, and it seemed to be an overclocking monster!
(Especially taking the dual-run into account)
Although, for the sake of science and stability, i went on to test on our in-house COMSOL-models afterwards, which seemed to crash the PC - After some deep investigations, it seemed that the Sudden spikes in current-consumption under AVX-loads seemed to bring the 850W power-supply to its knees.
I went on to tune an OC with adaptive voltage-settings, to lower the spikes, and keep the stability in order for us to run 24/7 sims.
This lead to an adaptive-volt overclock with 4.7Ghz and AVX-4/AVX512 -5.
This brings the wattage down to around 350w in (measurable)peaks, and brings my single-core-temps spikes to a sustainable 95c (compared to a steady average of ~65c)
Sadly, that also brings the performance back down towards the “slow” 54min-mark
So the limiting factor for the high performance for our in-house model stability seems to be power-supply (i believe a 1000-1200w supply could keep up with the ultra short load-spikes) and the single-core-temp spikes, which i imagine could only be kept in check with a proper Direct-die water-cooled solution, since i already grinded down the IHS a bit (Got 10-15c improvements, and took the hottest core down from ~+25c to +10c in relations to the coldest) even though this IHS is supposedly Soldered to the Die
Despite that, the in-house models are now running twice as fast as on the old i9-9900x - And actually we JUST tried with a dual-run, which has no impact on the sim-times, so it seems that we are capable of running 4x as fast as before.
Although the new OC seems to only be ~17% faster than stock, the new capabilities of the RAM-timings along with more and faster cores, brings our capabilities up quite a lot
